G 148 First Half
Identify the FALSE statement.
The contacts between plates are called passive margins
Which wave below has the shortest wavelength?
E - Pinkish wave the is smushed together
Identify the FALSE statement. According to present plate tectonics theory:
A continental plate will subduction under an oceanic plate when the two converge.
The figure below shows the ground motion associated with what type of earthquake waves?
R waves
It is jokingly said that in 100 million years Los Angeles, California, will have moved far enough north to become a suburb of Anchorage, Alaska. On the basis of this observation and knowing that the Pacific Plate is moving north at the rate of 6 cm per year, approximately how far is Los Angeles from Anchorage?
6,000 km or 3,720 mi
Identify the FALSE statement:
A spreading boundary is always in the middle of the ocean basin where it is located.
Examine the figure below. Which letter corresponds to the surface wave arrival time?
C - (Module 4 Homework look at picture)
Examine the waves below, which set of waves was produced by an earthquake?
C - (Module 4 Homework look at picture)
Which wave below has the largest amplitude?
E - Pinkish wave its tall
Which of the following statements about earthquake magnitude and intensity is true?
Earthquake magnitude has a single value for an earthquake while earthquake intensity decreases with increasing distance from the epicenter.
Identify the FALSE statement. A mid-ocean ridge:
Is covered by a layer of basalt lava blobs called dikes.
Which of the following statements about lithosphere and asthenosphere is TRUE?
Lithosphere consists of the crust and the upper mantle, and behaves like a rigid hard layer.
The center of a mid-ocean ridge is where:
New oceanic lithosphere is being created
The figure above is a side view of a cross section cut through the Earth's surface revealing a fault offsetting layers within the Earth. The squiggle at the top right is a tree at the Earth's surface. Which type of fault is shown in the cross section?
Normal
Match the fault motion with the type of stress which causes the fault motion.
Normal - Tension, Reverse - Compression, Strike Slip - Shear
Continents:
Passively ride along as the sea floor spreads
Which type of earthquake wave travels the fastest?
Primary
Which of the following earthquakes waves are body waves?
S & P Waves
The figure below illustrates the ground motion associated with which type of earthquake waves?
S waves
The figure above shows seismograms of an earthquake recorded at three different seismic stations (Seismo 1, Seismo 2, Seismo 3). Which seismic station was closest to the epicenter of the earthquake?
Seismo 2
Which of the following conditions will tend to make rocks change by ductile deformation rather than by brittle deformation?
Slowly applied stress
Identify the FALSE statement.
Strike slip faults result from two blocks of crust sliding past each other in a vertical manner.
Identify the FALSE statement.
The North American Plate is currently moving toward the northeast at about 10 feet per year.
Which statement about the 1906 San Francisco Earthquake is FALSE?
The San Andreas fault displacement was the same throughout the entire fault rupture length.
The intersection of an earthquake fault plane with the Earth's surface is typically produces ...
a surface rupture.
The chain of volcanoes along the west coast of South America (the Andes Mountains) exists because:
an oceanic plate is subducting under the western edge of the South American Plate.
Identify the FALSE statement. According to the mantle plume model, hot-spot plumes:
are thought to originate at the crust-mantle boundary.
The locations of major earthquakes and volcanic eruptions:
are usually along plate boundaries.
Which of the following surface materials will exhibit the least amount of shaking during an earthquake?
bedrock
Identify the FALSE statement. The rate of plate motion:
can range from 100 to 150 cm per year.
Continental mountain ranges such as the Alps, Himalayas, and Appalachians are the result of which of the following?
collision
Which of the following earthquake phenomena is the least likely to actually injure or kill humans?
ground shaking
What is the name for the point within the Earth where an earthquake originates?
hypocenter (focus)
What type of fault is shown in the photograph above?
left lateral
Brittle deformation
occurs when many atomic bonds are broken quickly and rock pieces separate.
How frequently do great earthquakes (magnitude 8 or greater) shake the Earth?
on average once per year.
Which statement is TRUE? Earthquakes in California are:
shallow and occur in the upper 15 km of crust, even though the San Andreas fault cuts through the crust to deeper depths.
The Mercalli Intensity of an earthquake is measured by determining the ..
the amount of damage caused by the earthquake
The figure above is a side view of a cross section cutting through the Earth's surface revealing a fault that offsets layers within the Earth. The squiggle to the top right is a tree at the Earth's surface. Which block is the footwall?
the block to the left of the fault
Which of the following did not occur during the 2001 Nisqually earthquake?
the earthquake caused motion along a fault which ruptured the Earth's surface
Which statement best describes the continental crust?
the upper crust is brittle and the lower crust is ductile
The global occurrence of earthquakes reveals that:
they usually occur on the boundaries of plates or at hot spots.
Earthquakes but not volcanoes occur in San Francisco because:
two plates are moving past each other there